/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Sampling/MeshBakerCommon.h
a pointer to the mesh that holds the nearest triangle
virtual const void * FindNearestTriangle ( const FVector3d & Point, double & NearestDistSqrOut, int & TriId, FVector3d & TriBaryCoords, const [IMeshSpatial::FQueryOptions](API\Runtime\GeometryCore\Spatial\IMeshSpatial\FQueryOptions) & Options ) const